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Deconvolution method for two-dimensional spatial-response mapping of lithographic infrared antennas.
J Alda1, C Fumeaux, I Codreanu
1School of Optics, University of Central Florida, PO Box 162700, Orlando, Florida 32816-2700, USA. j.alda@fis.ucm.es
Applied Optics
|March 8, 2008
Summary
Researchers measured the spatial impulse response of infrared detectors using a focused CO2 laser and deconvolution. The results closely matched simulations of dipole antenna near-field distributions.
Area of Science:
- Optoelectronics
- Nanophotonics
- Antenna Engineering
Background:
- Characterizing the spatial response of infrared detectors is crucial for understanding their performance, especially when their dimensions approach the wavelength of light.
- Antenna-coupled detectors offer unique properties for infrared detection but require precise spatial response analysis.
Purpose of the Study:
- To experimentally determine the spatial impulse response of antenna-coupled infrared detectors.
- To compare experimental measurements with theoretical predictions of near-field antenna behavior.
Main Methods:
- Utilized a tightly focused carbon dioxide (CO2) laser beam for a two-dimensional scan of the detector.
- Employed an experimental setup with submicrometer resolution.
- Applied an iterative deconvolution algorithm to process the scanned data and obtain the spatial impulse response.
Main Results:
- Successfully obtained the spatial impulse response of the antenna-coupled infrared detectors.
- Demonstrated good agreement between the experimentally measured spatial response and numerically computed near-field distributions of a dipole antenna.
Conclusions:
- The developed method accurately characterizes the spatial impulse response of subwavelength infrared detectors.
- Experimental validation confirms the theoretical models of dipole antenna near-field behavior in the context of infrared detection.
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